First, Cao Zhang.
The strokes are simple, connected by twisted ribbons, similar to this grass. However, its structure is straight, the brushwork is blunt, and there are waves in the strokes, especially at the beginning and end of the painting, which obviously retains the brushwork of the official script, and the words are independent, discontinuous and orderly arranged.
Second, this grass
Take off the traces of official script left by Cao Zhang, speed up the writing on the basis of Cao Zhang and regular script, and add links.
Third, weeds
Founded in the Tang Dynasty, Zhang Xu was the founder of weeds in the Tang Dynasty, so he was called "the sage of grass". Huai Su, a later monk, was also a master of weeds. Weeds are simpler and faster than today's grass, and their brushwork is more continuous and tortuous, lively and flying, and they are unrestrained and have the potential to gallop thousands of miles.